Although you can't access the menu bar for the remote copy of iTunes, you can use keyboard shortcuts to access most of the menu commands.

Normally, Cmd-, brings up Preferences but -- if you try it -- it brings up netTunes' own preferences!

Fortunately, there's a solution. There's a hidden shortcut in iTunes -- Cmd-y -- that also works. So, click on the remote iTunes window and press Cmd-y, and the remote iTunes' preferences will open. You can interact with it normally from there.